Liu Ruixi, Wu Linzhen, Liu Hao, Zhang Youkui, Ma Jianjun, Jiang Cairong, Duan Tao
School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, P. R. China.
National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
ACS Omega. 2021 Oct 22;6(43):28538-28547. doi: 10.1021/acsomega.1c02500. eCollection 2021 Nov 2.
Photocatalysts have been extensively used for hydrogen evolution or organic degradation. In this work, two different heterojunction types of composite photocatalysts, 1T-MoS@TiO with Schottky heterojunction and 2H-MoS@TiO with type-II heterojunction, are synthesized via hydrothermal synthesis. These two composite materials exhibit excellent photocatalytic activity toward the degradation of tannic acid, which is a typical organic in nuclear wastewater. At an optimal loading of 16% 1T-MoS, the 1T-MoS@TiO shows the highest degradation capacity of 98%, which is 3.2 times higher than that of pure TiO. The degradation rate of 16% 1T-MoS@TiO is much higher than that of 13% 2H-MoS@TiO. The enhanced photocatalytic activity might be attributed to the improved charge transfer according to the mechanism investigation, supported by the X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) analyses. This work provides new opportunities for constructing highly efficient catalysts for nuclear waste disposal.
光催化剂已被广泛用于析氢或有机降解。在这项工作中，通过水热合成法合成了两种不同异质结类型的复合光催化剂，具有肖特基异质结的1T-MoS@TiO和具有II型异质结的2H-MoS@TiO。这两种复合材料对单宁酸（核废水中的一种典型有机物）的降解表现出优异的光催化活性。在16%的1T-MoS最佳负载量下，1T-MoS@TiO表现出最高98%的降解能力，这是纯TiO降解能力的3.2倍。16%的1T-MoS@TiO的降解率远高于13%的2H-MoS@TiO。根据机理研究，通过X射线光电子能谱（XPS）和电化学阻抗谱（EIS）分析支持，光催化活性的增强可能归因于电荷转移的改善。这项工作为构建用于核废料处理的高效催化剂提供了新的机会。
